Odd Results with Color Sample and Crop Tools

I am using Photoshop CC on a MAC. When I use the Color Sampler Tool on an image, I used to get a small circle at the sample point with a number next to it indicating the sample point number. I now get two black squares at the selected sample point - one large, and a second smaller one at the lower right corner. I also am getting funny (small rectangles) at the corners of the crop as well as a black square when I use the Crop Tool. All this started when I downloaded a sample version of NIK Efex Software. Any idea what's going on?